Urban Daggertooth + Walking Ballista

Prerequisites

• Urban Daggertooth has at least one +1/+1 counter.
• Walking Ballista has at least two +1/+1 counters.

Steps

1. 1Activate Walking Ballista's second ability by removing a +1/+1 counter from it, dealing 1 damage to Urban Daggertooth.
2. 2Urban Daggertooth triggers, putting a +1/+1 counter on itself and Walking Ballista.
3. 3Repeat.

Effects

• Infinite +1/+1 counters on a creature
• Infinite proliferate